paregoric
noun
par·e·go·ric ˌper-ə-ˈgȯr-ik 
-ˈgär-,
ˌpa-rə-
: camphorated tincture of opium used especially to relieve pain
Example Sentences
Recent Examples on the Web Parents have always been overwhelmed by babies crying from teething and have used some truly awful, dangerous methods to stop the pain such as drinking alcohol, paregoric (a strong opioid), and now benzocaine. 
Philly.com, 7 June 2018
Philly.com, 7 June 2018 Word History
Etymology
French parégorique mitigating pain, from Late Latin paregoricus, from Greek parēgorikos, from parēgorein to talk over, soothe, from para- + agora assembly, from ageirein to gather
First Known Use
circa 1827, in the meaning defined above
Medical Definition
paregoric
noun
par·e·go·ric ˌpar-ə-ˈgȯr-ik, -ˈgōr-, -ˈgär-
: camphorated tincture of opium used especially to relieve pain